DE102016014752B4 - Reversible nasal cannula for high-flow ventilation - Google Patents

Abstract

Nasal cannula for high-flow ventilation, wherein the nasal cannula (1) has a base body (2), a single hose connection element (6) which is arranged on one side of the base body (2), and two nasal tubes (3) which extend from the Base body (2) extend away, characterized in that the base body (2) comprises two lip contact surface elements (4) arranged on opposite sides of the base body (2) and the nose tubes (3) are straight.

Description

The invention relates to a nasal cannula for high-flow ventilation, wherein the nasal cannula has a base body and two nasal tubes that protrude from the base body.

Patients who can breathe constantly on their own but require additional oxygen are treated with high-flow oxygen therapy. In this therapy, the patient is supplied with warmed and humidified breathing gas in the form of a mixture of oxygen and air. This improves the patient's oxygenation. A nasal cannula is used as an interface between the ventilator and the patient. There are variants in which each nostril is treated with its own tube and in which only one tube is used for both nostrils in order to keep the number of tube connections low. The invention deals with the alternative with a hose connection for both nostrils.

With a nasal cannula with a tube connection, the tube is introduced to the nasal cannula from one side of the patient. The nasal cannula has two nasal spines that are inserted into one of the nostrils.

From US 2004/0 261 797 A1 a nasal cannula is known which leads a tube from one side to a base body of the nasal cannula. The nasal cannula further comprises two hollow nasal spines which extend curved away from the base body in order to be able to be inserted into the nostrils. The nasal cannula has a further modular structure, whereby the nasal spines can be separated from the base body and turned so that the bend of the nasal spines points in the opposite direction than before. Furthermore, the base body can be connected to a tether on two opposite sides in order to change the side from which a breathing tube is brought to the base body. In this way, the nasal cannula is designed to be reversible. However, the disadvantage here is that the nasal cannula is difficult to use when the nasal cannula needs to be turned. Furthermore, the nasal cannula is difficult to manufacture because the modular parts have to be manufactured with small tolerances in order to avoid leakage problems.

The invention therefore has the task of providing a nasal cannula that is easy to use and can be turned without much effort.

The task is solved by the features of the independent claim. Advantageous further training is the subject of the dependent claims.

In the case of a nasal cannula for high-flow ventilation, wherein the nasal cannula has a base body and two nose tubes that extend away from the base body, it is provided according to the invention that the base body comprises two lip contact surface elements arranged on opposite sides of the base body and the nose tubes are straight are trained.

Due to the lip contact surface elements arranged on two opposite sides of the base body in combination with the straight nasal tubes, the nasal cannula can be turned without much effort. A ventilation tube can therefore be introduced to the patient's face from the left or right without the nasal cannula having to be adjusted to the new orientation before turning. The nasal cannula is arranged on the patient's lip with one of the two lip contact surface elements. The straight nasal tubes are inserted into the patient's nostrils. Due to the straight design of the nostrils, the nose tubes do not point away from the patient's nostrils after a turning process, so that the nasal tubes can be inserted into the nostrils even after a turning process.

The nose tubes are advantageously arranged on a third side of the base body, which connects the two sides with the lip contact surface elements. The third side thus has a fixed angular relationship to the lip contact surface elements, which can be the same on both sides with the contact surface elements. During a turning process, it is known exactly at what angle the straight nose tubes are to the lip contact surface elements.

Furthermore, the nose tubes are advantageously formed integrally with the base body. This means that leakage problems can be avoided, in contrast to modular nasal cannulas. Furthermore, the number of parts is reduced and no part of the nasal cannula can be lost when the orientation of the nasal cannula is changed, i.e. when the nasal cannula is turned.

The base body further advantageously has two coupling elements for connecting the nasal cannula to a headband holder.

It is expedient if the two coupling elements extend away from the base body on opposite sides with respect to the nose tubes. The two nose tubes are arranged between the coupling elements, wherein the coupling elements and the nose tubes are arranged along a line transverse to the direction of extension of the nose tubes. A coupling element extends away from the base body on one side of the nose tubes and the other coupling element extends on the other side of the nose tubes. This avoids having to place a strap across the patient's face. The coupling elements are located at points remote from the nose and mouth area for coupling with a tether. This makes the nasal cannula more comfortable for the patient to wear and can be easily connected to a strap.

The coupling elements and the nose tubes are advantageously arranged on a common side of the base body.

The coupling elements are expediently formed integrally with the base body.

The nasal cannula is advantageously designed symmetrically to a flat plane, with the longitudinal axes of the two nasal tubes running on the plane. This simply changes the side of the hose connection when the nasal cannula is turned. Otherwise there is no difference in the position or appearance of the nasal cannula for the user or the patient.

The lip contact surface elements are advantageously inclined towards one another at an angle between 15 degrees and 45 degrees, preferably between 20 degrees and 40 degrees, more preferably 30 degrees. This means that the nasal tubes can be easily inserted into the nostrils of a patient if the nasal cannula is arranged on one of the lips with a lip contact surface element.

• 1: eine schematische Darstellung einer Nasenkanüle in der Seitenansicht;
• 2: eine schematische Darstellung einer Nasenkanüle aus der Draufsicht; und
• 3: eine schematische Schnittdarstellung einer Nasenkanüle gemäß der Schnittlinie aus 2.

The invention is explained in more detail below using an advantageous exemplary embodiment with reference to the accompanying drawing. Show it:

• 1 : a schematic representation of a nasal cannula in side view;
• 2 : a schematic representation of a nasal cannula from a top view; and
• 3 : a schematic sectional view of a nasal cannula according to the cutting line 2 .

The nasal cannula for high-flow ventilation is referenced in its entirety with the reference number 1.

The nasal cannula 1 comprises according to 1 a base body 2, from which 2 nose tubes 3 extend. The base body 2 has a cavity 9 which is connected to the nose tubes 3 in a fluid-communicating manner. The nose tubes 3 therefore form a connection between the cavity 9 in the base body 2 and the environment.

The nasal cannula 1 further has a hose connection element 6, which is arranged on one side of the base body 2. The hose connection element 6 guides an air flow from a breathing hose into the cavity 9 of the base body 2, with the nose tubes 3 being aligned perpendicular to this direction of flow. An air stream that flows through the hose connection element 6 into the cavity 9 is blown out of the two nose tubes 3.

The base body 2 further comprises two lip contact surface elements 4, which are arranged on two opposite sides of the Bartz body 2. The nose tubes 3 are arranged on a third side 10 of the base body 2, which connects the side surfaces of the bass body 2, on which the lip contact surface elements 4 are located, to one another on one side of the base body 2.

Two coupling elements 5 are further arranged on the base body 2, with which the nasal cannula 1 can be fastened with a headband in order to fasten the nasal cannula 1 to a patient's face. The coupling elements 5 are arranged so that they extend the third side 10, on which the nose tubes 3 are arranged, laterally to the base body 2. Coupling elements 5 are therefore arranged on the same side as the nose tubes 3.

2 shows a top view of the nasal cannula 1, with a view through the nasal tubes 3 being provided. Out of 2 It can be seen that the nasal cannula 1 is designed symmetrically to a mirror plane 7, which includes the longitudinal axes 11 of the nasal tubes 3. This means that the mirror plane 7 intersects both nose tubes 3. As a result, the nasal cannula 1 can be turned on both sides, with only the direction of the hose connection element 6 changing for the patient.

The lip contact surface elements 4 also have a radius of curvature of 91 mm in their course transverse to the longitudinal axes of the nose tubes 3. The lip contact surface elements 4 are designed to be concave on the base body 2. Furthermore, the lip contact surface elements 4 have an extension of 32.7 mm in this direction.

Due to this measure, the lip contact surface elements 4 can be conveniently arranged on a patient's lip. For the patient This means increased comfort. Furthermore, slipping of the lip rest elements is avoided by the lip contact surface elements 4 and thus the nasal cannula 1.

Furthermore, the lip contact surface elements 4 are arranged at an angle 8 to one another. The angle 8 is chosen so that when the lip contact surface elements 4 are arranged on a patient's lip, the straight nose tubes 3 can be inserted into the patient's nostrils. The nasal tubes 3 are directed into the patient's nasal cavity.

Even when the nasal cannula 1 is turned, the nasal tubes 3 remain in the same angular position relative to the lip contact surface elements 4, so that they continue to be directed into the patient's nasal cavity even after the turning process. This is clearly in 3 shown, in which a sectional view along line AA 2 is shown.

The angle between the lip surface contact element 4 is 30°. The lip contact surface elements 4 thus have an angle of 15° relative to the outflow direction of the straight nose tubes 3. For most patients, this angle is the angle between the upper lip and the nostrils. This means that most patients can be optimally supplied with an air flow from the nasal tubes 3 with this fixed angle.

The nose tubes 3 are formed in one piece with the base body 2. This means that the nose tubes 3 are integrally fused in one piece with the base body 2. Removing the nose tubes 3 from the base body 2 is not possible without destruction. This increases the tightness of the nasal cannula 1, since there are no separation points between different modules that may need to be sealed.

Furthermore, the coupling elements 5 are formed integrally with the base body 2. The coupling elements 5 thus offer a secure hold of the base body 2 on the headband. In addition, the risk of injury to the patient is reduced because the coupling elements 5 cannot be separated from the base body 2. Since the connection between the coupling element 5 and the base body 2 is located very close to the patient's face, a separation of the coupling element 5 from the base body 2 would increase the risk of injury to the patient.

The coupling elements 5 further extend the third side 10, on which the two nose tubes 3 are arranged. This creates a continuous surface from one end of one headband element 5 over the third side 10 and to the end of the other headband element 5. In this way, the wearing comfort of the nasal cannula 1 for the patient is increased, since there are no sharp corners and edges near his face due to an attachment or a transition between the base body 2 and the coupling elements 5.

Reference symbols

1

Nasal cannula for high-flow ventilation

2

Base body

3

nose tube

4

Lip contact surface element

5

Holding element

6

Hose connection element

7

plane of symmetry

8th

angle

9

cavity

10

third party

11

Longitudinal axis

12

Side with lip contact surface element

Claims (9)

Nasal cannula for high-flow ventilation, wherein the nasal cannula (1) has a base body (2), a single hose connection element (6) which is arranged on one side of the base body (2), and two nasal tubes (3) which extend from the Base body (2) extend away, characterized in that the base body (2) comprises two lip contact surface elements (4) arranged on opposite sides of the base body (2) and the nose tubes (3) are straight. nasal cannula Claim 1 , characterized in that the nose tubes (3) are arranged on a third side (10) of the base body (2), which connects the two sides (12) with the lip contact surface elements. nasal cannula Claim 1 or 2 , characterized in that the nose tubes (3) are formed integrally with the base body (2). Nasal cannula according to one of the Claims 1 until 3 , characterized in that the base body (2) has two coupling elements (5) for connecting the nasal cannula (1) to a headband holder. nasal cannula Claim 4 , characterized in that the two coupling elements (5) extend away from the base body (2) on opposite sides with respect to the nose tubes (3). nasal cannula Claim 4 or 5 , characterized in that the coupling elements (5) and the nose tubes (3) are arranged on a common side (10) of the base body (2). Nasal cannula according to one of the Claims 4 until 6 , characterized in that the coupling elements (5) are formed integrally with the base body (2). Nasal cannula according to one of the Claims 4 until 7 , characterized in that the nasal cannula (1) is designed symmetrically to a flat plane of symmetry (7), the longitudinal axes (11) of the two nasal tubes (3) running on the plane of symmetry (7). Nasal cannula according to one of the Claims 1 until 8th , characterized in that the lip contact surface elements (4) are inclined towards one another at an angle between 15 degrees and 45 degrees, preferably between 20 degrees and 40 degrees, more preferably 30 degrees.

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